Table 4.

The variance analysis of the fitted quadratic polynomial prediction model of P.

Source	Sum of Squares	df	Mean Square	F	p2-Value
Model	1046.69	14	74.76	21.64	<0.0001
Residual	48.36	14	3.45
Lack of fit	38.99	10	3.90	1.66	0.3296
Pure error	9.38	4	2.34
Cor total	1095.09	28
CV%			2.18
R 2 2			0.9558